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Roof pitch is the steepness of a roof expressed as a ratio of inch (es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. A flat roof has a pitch of zero in either instance; all other roofs are pitched . A roof that rises 3 inches per foot, for example, would be described ...
Diffraction spike. Diffraction spikes are lines radiating from bright light sources, causing what is known as the starburst effect[ 1] or sunstars[ 2] in photographs and in vision. They are artifacts caused by light diffracting around the support vanes of the secondary mirror in reflecting telescopes, or edges of non-circular camera apertures ...
A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in ...
Just-noticeable difference. In the branch of experimental psychology focused on sense, sensation, and perception, which is called psychophysics, a just-noticeable difference or JND is the amount something must be changed in order for a difference to be noticeable, detectable at least half the time. [ 1]
Computer vision syndrome. Computer vision syndrome ( CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.
A shooting star from the Perseid meteor shower streaks through the night sky amid the vivid colors of aurora borealis over the North Sea near Pilsum, Germany, on Aug. 12, 2024. / Credit: Matthias ...
A 12-year-old girl from Florida is reported to be in critical condition after she was accidentally run over by her mom during her first day back at school. On Monday, Aug. 12 at approximately 7:45 ...
Followed by. "Hapworth 16, 1924". Raise High the Roof Beam, Carpenters and Seymour: An Introduction is a single volume featuring two novellas by J. D. Salinger, which were previously published in The New Yorker: Raise High the Roof Beam, Carpenters (1955) and Seymour: An Introduction (1959). Little, Brown republished them in this anthology in 1963.